package net.minecraft.world.pathfinder;

import net.minecraft.entity.Entity;
import net.minecraft.pathfinding.PathPoint;
import net.minecraft.util.IntHashMap;
import net.minecraft.util.MathHelper;
import net.minecraft.world.IBlockAccess;

public abstract class NodeProcessor {
	protected IBlockAccess blockaccess;
	protected IntHashMap<PathPoint> pointMap = new IntHashMap();
	protected int entitySizeX;
	protected int entitySizeY;
	protected int entitySizeZ;

	public void initProcessor(IBlockAccess iblockaccessIn, Entity entityIn) {
		this.blockaccess = iblockaccessIn;
		this.pointMap.clearMap();
		this.entitySizeX = MathHelper.floor_float(entityIn.width + 1.0F);
		this.entitySizeY = MathHelper.floor_float(entityIn.height + 1.0F);
		this.entitySizeZ = MathHelper.floor_float(entityIn.width + 1.0F);
	}

	/**
	 * This method is called when all nodes have been processed and PathEntity is
	 * created. {@link net.minecraft.world.pathfinder.WalkNodeProcessor
	 * WalkNodeProcessor} uses this to change its field
	 * {@link net.minecraft.world.pathfinder.WalkNodeProcessor#avoidsWater
	 * avoidsWater}
	 */
	public void postProcess() {
	}

	/**
	 * Returns a mapped point or creates and adds one
	 */
	protected PathPoint openPoint(int x, int y, int z) {
		int i = PathPoint.makeHash(x, y, z);
		PathPoint pathpoint = (PathPoint) this.pointMap.lookup(i);

		if (pathpoint == null) {
			pathpoint = new PathPoint(x, y, z);
			this.pointMap.addKey(i, pathpoint);
		}

		return pathpoint;
	}

	/**
	 * Returns given entity's position as PathPoint
	 */
	public abstract PathPoint getPathPointTo(Entity entityIn);

	/**
	 * Returns PathPoint for given coordinates
	 */
	public abstract PathPoint getPathPointToCoords(Entity entityIn, double x, double y, double target);

	public abstract int findPathOptions(PathPoint[] pathOptions, Entity entityIn, PathPoint currentPoint,
			PathPoint targetPoint, float maxDistance);
}
